September is one of the cooler months of the year in Goondiwindi, with average highs near 26°C and lows around 9.8°C (mean 17.9°C). It is one of the drier months, averaging 30 mm of rainfall and 54% relative humidity across the period.
September is one of the cooler months of the year in Goondiwindi. Across 45 years of records, the warmest September in Goondiwindi was 2000 — when the month averaged 21.1°C — while the coldest was 1984 at 14.5°C. Typical September days reach 26°C with nights near 9.8°C. The long-term trend is warming, about 0.6°C per decade.
September is one of the drier months in Goondiwindi, averaging 30 mm of rainfall. The wettest September on record was 2010 with 120 mm, while the driest was 2003 at 0 mm.
Relative humidity in Goondiwindi during September averages 54%. The most humid September was 1998 at 75%, and the least humid was 2019 at 32%.
September receives about 5.7 kWh/m²/day of solar energy in Goondiwindi. The sunniest September was 2003 at 6.3 kWh/m²/day, and the cloudiest was 2010 at 4.5.
Average wind speed in Goondiwindi during September is 2.6 m/s. The windiest September was 1988 at 3.1 m/s, while the calmest were 1981 and 1987 at 2.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 16.9°C | 17.1°C | 18.8°C | 18.3°C | 18.8°C | +1.9°C |
| Avg High | 24.9°C | 25.1°C | 27.1°C | 26.5°C | 26.8°C | +1.9°C |
| Avg Low | 8.9°C | 9.1°C | 10.4°C | 10.2°C | 10.8°C | +1.9°C |
| Avg Rain | 32 mm | 28 mm | 26 mm | 34 mm | 28 mm | -4 mm |
September temperatures in Goondiwindi have risen by about 2°C between 1981–1985 and 2021–2025.
September has ranged from a record low of 0.5°C (1995) to a record high of 39.3°C (2017).
Rainfall in September is one of the drier months, averaging 30 mm, with a wettest year of 120 mm.
A good time to visit Goondiwindi
September is a good time to visit Goondiwindi, with days averaging 26°C and nights around 9.8°C (mean 17.9°C, cooler than Goondiwindi's yearly average) and low rainfall. October and April are marginally more temperate, but September still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 26.8°C | 18.7°C | 10.6°C | 34.6°C | 5.4°C | 14 mm | 57% | 2.4 m/s | 5.7 |
| 2024 | 28.0°C | 19.6°C | 11.2°C | 35.2°C | 4.5°C | 20 mm | 45% | 2.4 m/s | 5.8 |
| 2023 | 29.6°C | 20.9°C | 12.1°C | 34.8°C | 5.2°C | 3 mm | 38% | 2.4 m/s | 6 |
| 2022 | 23.7°C | 17.0°C | 10.4°C | 29.5°C | 6.0°C | 68 mm | 65% | 2.6 m/s | 5.1 |
| 2021 | 25.6°C | 17.5°C | 9.3°C | 30.4°C | 2.7°C | 43 mm | 55% | 2.8 m/s | 5.7 |
| 2020 | 27.2°C | 19.3°C | 11.4°C | 34.7°C | 4.8°C | 17 mm | 53% | 2.8 m/s | 5.7 |
| 2019 | 28.6°C | 19.6°C | 10.7°C | 34.4°C | 4.4°C | 2 mm | 32% | 2.8 m/s | 6.2 |
| 2018 | 27.1°C | 18.9°C | 10.7°C | 33.3°C | 4.7°C | 12 mm | 49% | 2.8 m/s | 5.8 |
| 2017 | 29.0°C | 20.0°C | 11.0°C | 39.3°C | 4.6°C | 1 mm | 34% | 2.8 m/s | 6.2 |
| 2016 | 23.9°C | 16.8°C | 9.8°C | 27.6°C | 5.4°C | 91 mm | 66% | 2.8 m/s | 4.9 |
| 2015 | 25.5°C | 17.3°C | 9.1°C | 31.3°C | 4.2°C | 9 mm | 56% | 2.4 m/s | 5.9 |
| 2014 | 25.2°C | 17.3°C | 9.4°C | 32.5°C | 2.4°C | 17 mm | 56% | 2.7 m/s | 5.9 |
| 2013 | 30.4°C | 21.0°C | 11.7°C | 38.4°C | 7.5°C | 17 mm | 43% | 2.5 m/s | 6.2 |
| 2012 | 26.1°C | 17.7°C | 9.3°C | 32.3°C | 1.3°C | 14 mm | 53% | 2.5 m/s | 5.8 |
| 2011 | 25.7°C | 17.6°C | 9.5°C | 31.3°C | 2.7°C | 62 mm | 55% | 2.6 m/s | 5.8 |
| 2010 🌧️ | 23.2°C | 16.9°C | 10.6°C | 28.6°C | 3.6°C | 120 mm | 72% | 2.3 m/s | 4.5 |
| 2009 | 26.8°C | 18.5°C | 10.1°C | 35.4°C | 4.9°C | 57 mm | 53% | 2.7 m/s | 5.7 |
| 2008 | 26.1°C | 18.5°C | 10.8°C | 33.4°C | 5.4°C | 61 mm | 61% | 2.5 m/s | 5.5 |
| 2007 | 26.6°C | 18.2°C | 9.8°C | 34.5°C | 5.5°C | 5 mm | 49% | 2.4 m/s | 5.9 |
| 2006 | 27.3°C | 19.0°C | 10.6°C | 34.5°C | 5.5°C | 29 mm | 54% | 2.7 m/s | 5.9 |
| 2005 | 26.9°C | 18.8°C | 10.7°C | 32.9°C | 4.0°C | 15 mm | 56% | 2.8 m/s | 5.5 |
| 2004 | 25.5°C | 17.4°C | 9.4°C | 34.5°C | 1.9°C | 66 mm | 56% | 2.3 m/s | 5.8 |
| 2003 | 28.4°C | 19.3°C | 10.1°C | 36.4°C | 3.0°C | 0 mm | 43% | 2.7 m/s | 6.3 |
| 2002 | 27.4°C | 18.8°C | 10.2°C | 35.2°C | 4.3°C | 12 mm | 49% | 2.9 m/s | 5.7 |
| 2001 | 25.8°C | 17.9°C | 10.0°C | 30.9°C | 4.7°C | 11 mm | 58% | 2.5 m/s | 5.5 |
| 2000 🔥 | 29.8°C | 21.1°C | 12.4°C | 38.4°C | 4.8°C | 4 mm | 38% | 2.6 m/s | 5.8 |
| 1999 | 26.1°C | 18.1°C | 10.1°C | 32.1°C | 4.5°C | 24 mm | 58% | 2.6 m/s | 5.8 |
| 1998 | 24.0°C | 17.5°C | 11.1°C | 31.0°C | 4.1°C | 54 mm | 75% | 2.6 m/s | 5.1 |
| 1997 | 26.7°C | 18.5°C | 10.4°C | 31.7°C | 6.1°C | 29 mm | 54% | 2.5 m/s | 5.6 |
| 1996 | 25.5°C | 17.0°C | 8.5°C | 32.4°C | 2.4°C | 44 mm | 54% | 2.9 m/s | 5.7 |
| 1995 | 25.6°C | 17.8°C | 9.9°C | 30.4°C | 0.5°C | 49 mm | 55% | 2.5 m/s | 5.5 |
| 1994 | 25.0°C | 16.1°C | 7.3°C | 30.0°C | 2.3°C | 5 mm | 39% | 2.7 m/s | 6 |
| 1993 | 23.7°C | 16.2°C | 8.6°C | 33.3°C | 4.6°C | 40 mm | 62% | 2.8 m/s | 5.4 |
| 1992 | 24.2°C | 15.9°C | 7.7°C | 32.5°C | 2.7°C | 13 mm | 52% | 2.7 m/s | 5.6 |
| 1991 | 26.3°C | 17.5°C | 8.8°C | 32.1°C | 2.0°C | 2 mm | 40% | 2.8 m/s | 5.9 |
| 1990 | 24.1°C | 16.4°C | 8.7°C | 32.0°C | 2.3°C | 17 mm | 63% | 2.7 m/s | 5.7 |
| 1989 | 25.1°C | 16.2°C | 7.3°C | 33.3°C | 3.0°C | 3 mm | 54% | 2.6 m/s | 6.2 |
| 1988 | 24.9°C | 17.6°C | 10.3°C | 34.8°C | 4.2°C | 65 mm | 67% | 3.1 m/s | 5.3 |
| 1987 | 25.2°C | 16.7°C | 8.2°C | 30.8°C | 0.6°C | 8 mm | 57% | 2.2 m/s | 5.9 |
| 1986 | 25.7°C | 17.6°C | 9.5°C | 32.6°C | 0.8°C | 53 mm | 56% | 2.8 m/s | 5.6 |
| 1985 | 23.4°C | 15.7°C | 8.0°C | 30.5°C | 2.4°C | 13 mm | 59% | 2.5 m/s | 5.9 |
| 1984 ❄️ | 22.1°C | 14.5°C | 6.9°C | 26.5°C | 1.6°C | 47 mm | 62% | 2.7 m/s | 5.9 |
| 1983 | 25.5°C | 18.1°C | 10.8°C | 30.0°C | 5.2°C | 56 mm | 69% | 2.5 m/s | — |
| 1982 | 25.0°C | 17.0°C | 9.0°C | 32.2°C | 2.4°C | 38 mm | 50% | 2.6 m/s | — |
| 1981 | 27.0°C | 18.4°C | 9.8°C | 35.0°C | 3.1°C | 8 mm | 56% | 2.2 m/s | — |
Actual recorded September data for each year, 1981–2025 — sourced from NASA POWER.
The average high in September is around 26°C with lows near 9.8°C (mean 17.9°C), based on 45 years of NASA POWER data.
September averages 30 mm of rainfall in Goondiwindi, one of the drier months. The wettest on record was 120 mm in 2010.
The hottest September reached 39.3°C in 2017. The coldest dipped to 0.5°C in 1995.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average September temperatures have risen by about 2°C. Daytime highs moved from 24.6°C to 26.7°C and overnight lows from 8.9°C to 10.7°C over the same span.
September is one of the cooler months of the year in Goondiwindi and one of the drier months, so plan for around 26°C daytime highs and 9.8°C at night.
Not quite — September is the 5th coolest month in Goondiwindi, averaging 17.9°C.
For September in Goondiwindi, pack light layers you can adjust through the day, with typical highs of 26°C and lows of 9.8°C.
Relative humidity in September averages 54% — relatively dry.
Average wind speed in September is 2.6 m/s. The windiest September on record averaged 3.1 m/s (1988).
The wettest September on record was 2010 with 120 mm. On average, September sees 30 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Goondiwindi behaves each September, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for September specifically, along with year-by-year records and how the month has changed over the decades.
